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並前往https://www.usgs.gov/volcanoes/mount-st.-helens/1980-cataclysmic-eruption

1980 Cataclysmic Eruption | U.S. Geological Survey - USGS.gov

Magma began intruding into the Mount St. Helens edifice in the late winter and early spring of 1980. By May 18, the cryptodome (bulge) on the north flank ...

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